package com.ljfiction.book.MyView;

import java.io.UnsupportedEncodingException;
import java.security.MessageDigest;
import java.security.NoSuchAlgorithmException;

public class Md5Util {
		/**
		 * MD5工具
		 * @param str
		 * @return
		 */
		public static String md5(String str) {
	      if (str == null) {
	          return null;
	      }
	      MessageDigest messageDigest = null;

	      try {
	          messageDigest = MessageDigest.getInstance("MD5");
	          messageDigest.reset();
	          messageDigest.update(str.getBytes("UTF-8"));
	      } catch (NoSuchAlgorithmException e) {
	          return str;
	      } catch (UnsupportedEncodingException e) {
	          return str;
	      }

	      byte[] byteArray = messageDigest.digest();
	      StringBuffer md5StrBuff = new StringBuffer();
	      for (int i = 0; i < byteArray.length; i++) {
	          if (Integer.toHexString(0xFF & byteArray[i]).length() == 1)
	              md5StrBuff.append("0").append(Integer.toHexString(0xFF & byteArray[i]));
	          else
	              md5StrBuff.append(Integer.toHexString(0xFF & byteArray[i]));
	      }
	      return md5StrBuff.toString();
	    }
}
